The U.S. Federal Communications Commission is proposing a $25,000 fine against Google for "deliberately impeded and delayed" an ongoing investigation into whether it breached federal laws over its street-mapping service, the Wall Street Journal reports.

The FCC initiated an investigation in 2010 after Google collected and stored payload data from unencrypted wireless networks as part of its Google Maps Street View service. Its intended use, Google says, was to build up a list of Wi-Fi network hotspots to aid geolocation services on mobile devices through 'assisted-GPS'.

Google also drew fire from the UK's data protection agency after it was told it committed a "significant breach" of the UK and European data laws when it collected wireless data from home networks. It was audited by the regulator and was told it "must do more" to improve its privacy policies. Google said it had taken "reasonable steps" to further protect the data of its users and customers.

But the FCC stopped short of accusing Google of directly violating data interception and wiretapping laws, citing lack of evidence. The federal communications authority did not fine the company under eavesdropping laws, as there is no set precedent for applying the law against 'fair-game' unencrypted networks.

The FCC took the action after it believed Google was reluctant to co-operate with the authorities after the scandal emerged. An FCC statement added that a Google engineer thought to have written the code that collected the data invoked his Fifth Amendment rights to prevent self-incrimination.

Google can appeal the fine. Despite the fine being a mere fraction of the company's U.S. annual turnover, not doing so until its legal avenues are exhausted would almost be an admittance of guilt.

The search giant eventually offered an opt-out mechanism for its location database by adding text to the networks' router name. But further controversy was drawn after another Silicon Valley company offered an opt-out only solution.